Authors:

Using release node techniques in diffusion Monte Carlo method, we
study the unpolarized atomic fermi gas
in the unitarity regime. We use several types of the trial and
guiding wave functions to elucidate the
size of fixed-node error. We also analyze the changes in the
nodal surfaces for trial functions with
varying degree of the pairing strength. We study the bosonic
component in
guiding functions in order to optimize the extraction of the
fixed-node bias and corresponding
error bars. The most accurate results for the fixed-node bias
were obtained using the
the BCS-based guiding functions.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.L23.8